Barvanje pletiva iz votlih PA 6 vlaken pri različnih parametrih

Mulec, Irena (author), Gorjanc, Marija (mentor), Tomšič, Brigita (comentor)

Namen diplomskega dela je bil proučiti vpliv parametrov barvanja, kot so temperatura, čas in pH na stopnjo izčrpanja barvila, obarvanost, barvno razliko in enakomernost obarvanja snutkovnega pletiva iz mešanice votlih poliamidnih 6 vlaken in elastana (PA 6/EL). Za barvanje proučevanega PA 6/EL pletiva sta bili uporabljeni kislo in 1:2 kovinsko kompleksno barvilo. Barvanje je potekalo v barvalnem stroju IR DYER proizvajalca Rapid, Turčija pri treh različnih temperaturah (T = 98, 110 in 120 °C), štirih različnih časih barvanja (t = 40, 80, 120 in 160 min) ter štirih različnih pH vrednostih barvalne kopeli (5, 6, 7 in 8). Na podlagi UV/VIS spektrofotometričnih meritev absorbance barvalne kopeli pred in po barvanju pri valovni dolžini absorpcijskega maximuma proučevanih barvil je bila določena stopnja izčrpanja barvila, na podlagi barvnometričnih meritev pa določeni obarvanost, enakomernost obarvanja in barvna razlika proučevanih vzorcev PA 6/EL pletiva. Z opazovanjem površine vzorcev s stereomikroskopom je bila opravljena tudi vizualna ocena enakomernosti obarvanja vzorcev. Na podlagi rezultatov je bilo ugotovljeno, da T, t barvanja ter pH kopeli nimajo bistvenega vpliva na stopnjo izčrpanja kislega barvila, pri čemer je višanje T barvanja vplivalo tako na višanje intenzitete obarvanja PA 6/EL vzorcev kot tudi na povišanje ΔEab*. V nasprotju s kislim barvilom sta višanje T in t barvanja vplivali na povišanje stopnje izčrpanja 1:2 kovinsko kompleksnega barvila, višanje pH pa na njeno zmanjšanje. Naraščanje T barvanja je v največji meri vplivalo na intenziteto obarvanja PA 6/EL pletiva, medtem ko je višanje pH vrednosti kopeli vplivalo na povečanje neenakomernosti obarvanja. Z vizualno analizo na nobenem od proučevanih vzorcev PA 6/EL pletiva ni bilo moč zaznati progavosti po barvanju, je pa barvanje pri daljših t barvanja pri vrenju in šibko kislem pH povzročilo poškodbe na votlih poliamidnih vlaknih, ki so bile opazne v obliki razpršenih črtic različnih dimenzij.

• Language: Slovenian
• Keywords: barvanje, poliamid 6, pletivo, kisla barvila, kovinsko kompleksna barvila, vpliv parametrov
• Work type: Bachelor thesis/paper
• Organization: NTF - Faculty of Natural Sciences and Engineering
• Year: 2018
• PID: 20.500.12556/RUL-102593
• Publication date in RUL: 05.09.2018

Secondary language

• Language: English
• Title: Dyeing of knitted hollow PA 6 fibre at different parameters

Abstract

The purpose of the diploma thesis was to study the influence of dyeing parameters, such as temperature, time and pH of the dyeing bath on the degree of exhaustion, dyeing strength, colour change and the coloration uniformity of the mixture of hollow polyamide 6 fibres and elastane (PA 6/EL). For dyeing the PA 6/EL knitted fabric, acid dye and 1: 2 metallic complex dye were used. Dyeing took place in the IR DYER dyeing machine manufactured by Rapid, Turkey at three different temperatures (T = 98, 110 and 120 °C), four different dyeing times (t = 40, 80, 120 and 160 min) and four different pH values of the medium in the range 5-8. On the basis of UV/VIS spectrophotometric measurements of the absorbance of the dye bath before and after dyeing at the wavelength of the absorption maximum of the studied dyes, the degree of exhaustion of the dye was determined, and on the basis of colorimetric measurements the intensity and the uniformity of the studied PA 6/EL samples. Using stereomicroscope, a visual assessment of the of dyeing uniformity of the samples was made. On the basis of the results, it was found that the change in T, t and the pH of the medium did not have a significant effect on the rate of exhaustion of the acid dye, the rise in T dyeing was influenced both by the increase in the colour intensity of the PA 6/EL samples and the increase in ΔEab*. In contrast to the acid dye, the elevation of dyeing T and t influenced the increase in the rate of the 1: 2 metallic complex dye exhaustion, the elevation of pH resulted in its decrease. The increase in dyeing T had the greatest influence on the colour intensity of PA 6/EL knitted fabric, while the increase in the pH of the medium influenced the increase in dyeing uniformity and, consequently, to higher values ΔEab* of these samples. Using visual analysis of PA 6/EL knitting patterns, it was not possible to detect bareé effect after dyeing, but dyeing for longer time and at slightly acidic pH resulted in damage of hollow polyamide fibres, which was noticeable in the form of dispersed dashes of various dimensions.

• Keywords: colouring, hollow polyamide 6, bareé effect, acid dye, 1:2 metal complex dye